Adjustable power saw



Jan. 25,1927.

c. E. JOHNSON ADJUSTABLE POWER sAw Filed Dec. 1o, 124

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Patented Jan. 25, 1927.

CLARENCE EDWARD JOHNSON, OF DYERVILLE, CALIFORNIA.

ADJUSTABLE POWER SAW.

Application filed December 10, 1924. Serial No. 755,120.

This invention relates to an improvement in power cross-cut saws and has particular` reference to mechanism whereby the crosscut saw may be adjusted for making cuts'in various positions within a radius of approximately l It is an object of the present invention to provide a support for a conventional crosscut drag saw whereby such saw l.may be adjusted to various cutting positions from a horizontal to a vertical position.

It is a further object of the invention to provide such a saw supporting mechanism to fully adaptv it for cutting down trees or stumps and which may be reversed so as to enable the saw to cut from either side of said tree or .stump and to cut such trees or stumps into lengths after they have been felled.

It is a further object of the invention to provide such a mechanism which is eX- tremely simple in construction, strong, durable and highly convenient in operation.

In the accompanying drawing, wherein for the purpose of illustration, is shown a preferred embodiment of the invention,

Fig. 1 is a side elevation of the mechanism embodyingthe invention, with the saw omitted.

Fig. 2 is a vertical sectional view taken on line AMA of Fig. 1,

Fig. 3 is e horizontal sectional view taken on line B-B of Fig. 2, and

Fig. 4 is a plan view of the machine.

Referring specifically to the drawings, the numeral 1 designates horizontal frame members, preferably of I formation. The frame members 1 are broken away, as clearly indicated, it not being deemed necessary to show the entire length of the machine. Numeral 2 designates angular cross members connecting the side frame members 1, one of which is shown clearly in Fig. 4.

Referring particularly to Figs. 2 and 3, the numeral 3 designates a yoke member,

as supported for swinging movement upon a transverse drive shaft 4, said shaft being carried in bearings 5 and 6 mounted upon the side frame members 1, as clearly indicated. The bearings 5 and 6 may be adjusted longitudinally of the frame members 1 by adjusting screws 7. Motion is imparted to the shaft 4 through the medium of a sprocket wheel 5 rigidly secured thereto and receiving rotation from a source of power such as an internal combustion engine or an electric motor, not shown. The yoke 3 is provided with a vertical bearing 8 for receiving a vertical shaft 9, said shaft extending above and below said bearing 8 and rigidly carrylng at its upper end a bevel gear 10 and at its lower end, rigidly supporting a crank arm 11, said crank arm in turn carrying a wrist pin 12, for connection with the conventional drag saw (not shown). The bearing 8 may carry suitable bushings, indicatedby dotted line, in Figs. 2 and 3.

The yoke 3 is adapted for partaking of movement transversely of the frame 1, for alternately bringing bevel gears 13 and 14 into mesh with the bevel gear 10 whereby operation of the crank 11 may be reversed for operating on the opposite side of the frame. The yoke 3 is positively held in operative position by a latch member 15, as clearly shown in Figs. 2 and 4. As before stated, the yoke 3 is adapted to partake of lswinging movement upon the shaft 4 and means are thereby provided for retaining such yoke in adjusted position within a radius of 45 from the horizontal. This adjustable means embodies a radius rod 16, supported upon the yoke 3 through the medium of a set screw 17 and having its free end operating between clamps 18 and 19, in turn secured to the side frame, members 1, as clearly shown in Fig. 4. The rod 16 is rigidly` clamped between the members 18 and 19 through the medium of bolt 20. It will therefore be yobvious that the radius rod may be adjusted to wholly retain the yoke 3 in various positions of adjustment and consequently retaining the drag saw in a corresponding position where- .by it will adapt itself to make cuts at various angles as before pointed out.

The yoke is provided with a pair of ears 21 arranged upon opposite sides of the bearing 8 for supporting a pair of brace rods 22, having pointed ends 23, as clearly shown in Fig. 4. The purpose of these brace rods is to provide greater rigidity to the yoke 3 after itf has been set into operative position, said pointed ends being driven into any convenient support such as a fallen tree, stump, ete.

Rigidly attached to the shaft l is a pinion 2l-V adapted to mesh with a corresponding pinion 25 carried upon a cross shaft 26 and in suitable bearings 27 upon the side frame members 1. The cross shaft 26 extends beyond the opposite sides of the frame members and carries upon one end a crank arm 27', corresponding in shape and size to crank arm 1l. The crank arm 2T carries a wrist pin 28 adapted for connection with a conventional drag saw (not shown). The ,shaft 26 carries on its opposite end a spool or winding drum 29 whereby power may be taken from the machine for other purposes through the medium of a suitable belt.

The operation of the machine is as follows:

It being desired to fell a tree, it is natural that the saw should `be arranged in a horizontal position. Consequently, it is attached through the medium of a suitable bearing tothe wrist pin 12 of the crank 11. If rthe cut is to be a horizontal one, the yoke member 3 is adjusted in a vertical position as shown in the drawing and the brace rods are suitably attached into any convenient support and the radius rods are rigidly clamped between the clamps 18 and 19. Motion is then imparted to the sprocket wheel 5 such motion in turn being imparted to the vertical shaft 9 through the medium of the bevel gears lil and 10, as the case may be. rlhe shifting of the yoke 3, transversely of the vframe A1, will result in bringing the bevel gear 13 into mesh with the bevel gear 10, consequently, a reversal of motion of the crank arm 11. If it is desired to make a vertical cut, as when a tree has been felled and it is desired to cut it into lengths, the saw is attached to the crank arm 27 and motion is imparted to the shaft. 26 through the medium of the sprocket 5 and gears 2-1 and 25.

It will be obvious from the foregoing that an extremely simple and efficient mechanism has been provided whereby a conventional drag saw may be adapted to various positions for making cut-s either in a horizontal or a vertical position. The mechanism is extremelysimple, requiring very little attention and providing` few parts which are apt to wear or get out of order. The drum 29 may be adapted for connection to any other mechanism whereby power may be taken from the source of power of the saw frame and utilized in many different ways. The

bearings 5 and 6 are adjustable for taking up light wear and the bearing S may be suitably braced and provided with suitable bearings to avoid wear at this point.

:ltis to 'be understood that the form of the invention, herewith shown and described, is to be taken as the preferredone but that various changes in the shape, size and the arrangen'ient of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having described my invention, what I claim is:

1. A ,device of the character described comprising a main frame, a drive shaft and a driven shaft carried thereby, a supporting yoke mounted for swinging movement upon the drive shaft to swing in a vertical plane, a bearing carried by said supporting yoke, a shaft carried by said bearing, a crank arm arried by the lower endY of said shaft for attachment to a drag saw, a bevel gear carried by the upper end of said Ilast named shaft, a pair of beveled gears carried by said drive shaft and adapted to alternately mesh with said first named bevel gear, means for shifting said yoke and said drive shaft transversely of the frame, alternately bringing` said beveled gears into engagement, latch means for retaining said yoke and shaft in Ithe last named adjusted position, said second transverse shaft lying in parallelism with the drive shaft and carried by said frame, gearing carried by said drive shaft for imparting rotation to said last named shaft, and a crank arm carried upon said last named shaft, outwardly of said frame and adapted to have connection 'with a drag saw.

2. A device of the character described comprising a main frame, a drive shaft and a driven shaft carried thereby, a supporting yoke carried bysaid drive shaft for partaking of vertical movement, a shaft carried by said yoke, a bevel gear carried by the upper end of said last named shaft, bevel gears carried by said drive shaft and adapted to alternately engage said last named bevel gears, means for shifting said yoke and said drive shaft laterally of the frame for alter-- iately bringing said bevel gears in mesh, latch means carried by the frame for hold-- ing said yoke in adjusted position, a radius rod carried by said yoke for effecting vertical adjustment of said yoke, clamps carried by said frame for engagement with said radius rod, whereby said yoke is retained in adjusted vertical position, means carried by said drive shaft for driving said driven shaft, a crank arm carried by said driven shaft outwardly of said frame fo* attachment to a drag saw, brace rods carried by said yoke whereby said yoke will be positivelj7 held after adjustment of the radius rod to prevent undue motion, said vertical sha-ft carrying at its lower end a crank arni for attachn'ient to a drag saw, bearings for said drive shaft carried by said frame and means carried by said frame for adjusting' said bearings longitudinally of said frame.

3. A device of the character described comprising a main frame, a drive shaft and a driven shaft carried by said frame, a suplll@ porting` yoke carried by said drive shaft, a vertical sha-ft carried by Said yoke, a crank zii-1n carried by said `vertical shaft for conneetion With a drag saw to impart movenient to said saw in a horizontal position` ineans for adjusting said yoke in a vertical plane, a Crank arm carried by said driven shaft, outwardly of said frame for attachment to a drag saw whereby said savv will partake of cutting action in a vertical piane 10 and means carried by said drive shaft for reversing the movement of said irst named crank arm whereby said saw may out upon the opposite side of a tree Without changing the positions of said frame, all as substan- 15 tially shown and described.

CLARENCE EDWARD JOHNSON. 

